TubeDatabase
  • Tubes
  • Testers
  • Companies
  • Submit
  • About

Tube Database (7,341 tube types · 1,270 archive entries)

Other (3,257 tube types), Pre (2,314 tube types), Power (1,030 tube types), Rectifier (740 tube types)
DisclaimerSubmit a tube

Tube-number record

20HP4, 20HP4A, 20HP4B, 20HP4C, 20HP4D

0 archive entries

BrandTung-Sol
ClassCathode Ray Tube
BaseDuodecal
Filament6.3 V @ 0.6 mA

Construction

Primary TypeDisplay / CRT
EnvelopeRectangular Glass
Sections1

Filament / Heater

Heater NotesAC or DC

Absolute Maximum Ratings

Plate Voltage16000 V
Grid 2 Voltage500 V
Grid 1 Voltage125 V
H-C Voltage410 V

Audio Performance

Key Features
  • Low voltage electrostatic focus
  • Magnetic deflection
  • Spherical faceplate
  • Grey filter faceplate
  • External single field ion trap
  • Rectangular glass construction

Typical Operation

ModePlate VGm (µmhos)Rp (Ω)µPlate mA
Typical14000 V———0.1 mA

Filters

0 tubes found

Manufacturers

Brands

    0 results